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365 lines
7.0 KiB
C
365 lines
7.0 KiB
C
/*
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* Copyright (C) 1984-2023 Mark Nudelman
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*
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* You may distribute under the terms of either the GNU General Public
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* License or the Less License, as specified in the README file.
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*
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* For more information, see the README file.
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*/
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/*
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* Routines to execute other programs.
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* Necessarily very OS dependent.
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*/
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#include "less.h"
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#include <signal.h>
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#include "position.h"
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#if MSDOS_COMPILER
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#include <dos.h>
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#if MSDOS_COMPILER==WIN32C && defined(MINGW)
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#include <direct.h>
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#define setdisk(n) _chdrive((n)+1)
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#else
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#ifdef _MSC_VER
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#include <direct.h>
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#define setdisk(n) _chdrive((n)+1)
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#else
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#include <dir.h>
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#endif
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#endif
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#endif
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extern int screen_trashed;
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extern IFILE curr_ifile;
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#if HAVE_SYSTEM
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/*
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* Pass the specified command to a shell to be executed.
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* Like plain "system()", but handles resetting terminal modes, etc.
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*/
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public void lsystem(char *cmd, char *donemsg)
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{
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int inp;
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#if HAVE_SHELL
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char *shell;
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char *p;
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#endif
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IFILE save_ifile;
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#if MSDOS_COMPILER && MSDOS_COMPILER!=WIN32C
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char cwd[FILENAME_MAX+1];
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#endif
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/*
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* Print the command which is to be executed,
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* unless the command starts with a "-".
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*/
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if (cmd[0] == '-')
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cmd++;
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else
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{
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clear_bot();
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putstr("!");
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putstr(cmd);
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putstr("\n");
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}
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#if MSDOS_COMPILER
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#if MSDOS_COMPILER==WIN32C
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if (*cmd == '\0')
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cmd = getenv("COMSPEC");
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#else
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/*
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* Working directory is global on MSDOS.
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* The child might change the working directory, so we
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* must save and restore CWD across calls to "system",
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* or else we won't find our file when we return and
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* try to "reedit_ifile" it.
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*/
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getcwd(cwd, FILENAME_MAX);
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#endif
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#endif
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/*
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* Close the current input file.
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*/
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save_ifile = save_curr_ifile();
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(void) edit_ifile(NULL_IFILE);
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/*
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* De-initialize the terminal and take out of raw mode.
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*/
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deinit();
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flush(); /* Make sure the deinit chars get out */
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raw_mode(0);
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#if MSDOS_COMPILER==WIN32C
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close_getchr();
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#endif
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/*
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* Restore signals to their defaults.
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*/
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init_signals(0);
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#if HAVE_DUP
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/*
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* Force standard input to be the user's terminal
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* (the normal standard input), even if less's standard input
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* is coming from a pipe.
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*/
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inp = dup(0);
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close(0);
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#if !MSDOS_COMPILER
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if (open_tty() < 0)
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#endif
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dup(inp);
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#endif
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/*
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* Pass the command to the system to be executed.
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* If we have a SHELL environment variable, use
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* <$SHELL -c "command"> instead of just <command>.
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* If the command is empty, just invoke a shell.
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*/
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#if HAVE_SHELL
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p = NULL;
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if ((shell = lgetenv("SHELL")) != NULL && *shell != '\0')
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{
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if (*cmd == '\0')
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p = save(shell);
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else
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{
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char *esccmd = shell_quote(cmd);
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if (esccmd != NULL)
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{
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int len = (int) (strlen(shell) + strlen(esccmd) + 5);
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p = (char *) ecalloc(len, sizeof(char));
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SNPRINTF3(p, len, "%s %s %s", shell, shell_coption(), esccmd);
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free(esccmd);
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}
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}
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}
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if (p == NULL)
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{
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if (*cmd == '\0')
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p = save("sh");
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else
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p = save(cmd);
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}
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system(p);
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free(p);
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#else
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#if MSDOS_COMPILER==DJGPPC
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/*
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* Make stdin of the child be in cooked mode.
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*/
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setmode(0, O_TEXT);
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/*
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* We don't need to catch signals of the child (it
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* also makes trouble with some DPMI servers).
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*/
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__djgpp_exception_toggle();
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system(cmd);
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__djgpp_exception_toggle();
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#else
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system(cmd);
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#endif
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#endif
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#if HAVE_DUP
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/*
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* Restore standard input, reset signals, raw mode, etc.
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*/
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close(0);
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dup(inp);
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close(inp);
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#endif
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#if MSDOS_COMPILER==WIN32C
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open_getchr();
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#endif
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init_signals(1);
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raw_mode(1);
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if (donemsg != NULL)
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{
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putstr(donemsg);
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putstr(" (press RETURN)");
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get_return();
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putchr('\n');
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flush();
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}
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init();
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screen_trashed = 1;
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#if MSDOS_COMPILER && MSDOS_COMPILER!=WIN32C
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/*
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* Restore the previous directory (possibly
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* changed by the child program we just ran).
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*/
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chdir(cwd);
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#if MSDOS_COMPILER != DJGPPC
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/*
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* Some versions of chdir() don't change to the drive
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* which is part of CWD. (DJGPP does this in chdir.)
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*/
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if (cwd[1] == ':')
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{
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if (cwd[0] >= 'a' && cwd[0] <= 'z')
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setdisk(cwd[0] - 'a');
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else if (cwd[0] >= 'A' && cwd[0] <= 'Z')
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setdisk(cwd[0] - 'A');
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}
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#endif
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#endif
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/*
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* Reopen the current input file.
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*/
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reedit_ifile(save_ifile);
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#if defined(SIGWINCH) || defined(SIGWIND)
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/*
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* Since we were ignoring window change signals while we executed
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* the system command, we must assume the window changed.
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* Warning: this leaves a signal pending (in "sigs"),
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* so psignals() should be called soon after lsystem().
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*/
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winch(0);
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#endif
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}
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#endif
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#if PIPEC
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/*
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* Pipe a section of the input file into the given shell command.
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* The section to be piped is the section "between" the current
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* position and the position marked by the given letter.
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*
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* If the mark is after the current screen, the section between
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* the top line displayed and the mark is piped.
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* If the mark is before the current screen, the section between
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* the mark and the bottom line displayed is piped.
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* If the mark is on the current screen, or if the mark is ".",
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* the whole current screen is piped.
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*/
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public int pipe_mark(int c, char *cmd)
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{
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POSITION mpos, tpos, bpos;
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/*
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* mpos = the marked position.
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* tpos = top of screen.
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* bpos = bottom of screen.
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*/
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mpos = markpos(c);
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if (mpos == NULL_POSITION)
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return (-1);
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tpos = position(TOP);
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if (tpos == NULL_POSITION)
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tpos = ch_zero();
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bpos = position(BOTTOM);
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if (c == '.')
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return (pipe_data(cmd, tpos, bpos));
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else if (mpos <= tpos)
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return (pipe_data(cmd, mpos, bpos));
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else if (bpos == NULL_POSITION)
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return (pipe_data(cmd, tpos, bpos));
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else
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return (pipe_data(cmd, tpos, mpos));
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}
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/*
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* Create a pipe to the given shell command.
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* Feed it the file contents between the positions spos and epos.
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*/
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public int pipe_data(char *cmd, POSITION spos, POSITION epos)
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{
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FILE *f;
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int c;
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/*
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* This is structured much like lsystem().
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* Since we're running a shell program, we must be careful
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* to perform the necessary deinitialization before running
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* the command, and reinitialization after it.
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*/
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if (ch_seek(spos) != 0)
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{
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error("Cannot seek to start position", NULL_PARG);
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return (-1);
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}
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if ((f = popen(cmd, "w")) == NULL)
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{
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error("Cannot create pipe", NULL_PARG);
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return (-1);
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}
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clear_bot();
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putstr("!");
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putstr(cmd);
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putstr("\n");
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deinit();
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flush();
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raw_mode(0);
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init_signals(0);
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#if MSDOS_COMPILER==WIN32C
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close_getchr();
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#endif
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#ifdef SIGPIPE
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LSIGNAL(SIGPIPE, SIG_IGN);
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#endif
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c = EOI;
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while (epos == NULL_POSITION || spos++ <= epos)
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{
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/*
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* Read a character from the file and give it to the pipe.
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*/
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c = ch_forw_get();
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if (c == EOI)
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break;
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if (putc(c, f) == EOF)
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break;
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}
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/*
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* Finish up the last line.
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*/
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while (c != '\n' && c != EOI )
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{
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c = ch_forw_get();
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if (c == EOI)
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break;
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if (putc(c, f) == EOF)
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break;
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}
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pclose(f);
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#ifdef SIGPIPE
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LSIGNAL(SIGPIPE, SIG_DFL);
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#endif
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#if MSDOS_COMPILER==WIN32C
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open_getchr();
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#endif
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init_signals(1);
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raw_mode(1);
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init();
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screen_trashed = 1;
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#if defined(SIGWINCH) || defined(SIGWIND)
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/* {{ Probably don't need this here. }} */
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winch(0);
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#endif
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return (0);
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}
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#endif
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